[Nut-upsuser] R: R: NUT and relay on USB

Maurizio Iacaruso maurizio.iacaruso at gmail.com
Tue Jan 20 14:32:10 UTC 2015

Setup that I was on mind is a little different, but I think your setup works

In my setup the HUB is connected directly to the UPS, then the cables go to
raspberry and device.

In your setup the HUB is connected directly to the raspberry, then the
cables go to UPS and Device.


It’s Ok?


In both configurations I need the same things: Male B->female A adaptor, HUB
and 2 male A-> male A cables. 

The male A- male A cables have any peculiarity? Can I buy it or make it
myself without problems? 


Thanks a lot for advice. 




Da: Charles Lepple [mailto:clepple at gmail.com] 
Inviato: martedì 20 gennaio 2015 14:23
A: Maurizio Iacaruso
Cc: NUT List
Oggetto: Re: [Nut-upsuser] R: NUT and relay on USB


On Jan 20, 2015, at 7:43 AM, Maurizio Iacaruso <maurizio.iacaruso at gmail.com
<mailto:maurizio.iacaruso at gmail.com> > wrote:

I connect USB A (female) to USB B (male) adapter -> HUB -> 2 USB wires male
to male,  one to raspberry and another one to my device.


I'm not sure I understand your setup.


This should work, using standard USB cables:


 <- upstream       downstream ->

     <- host       device ->


            A->B   A->B


Raspberry Pi -> hub -> UPS


                 \---> device


The problem is that there is no equivalent of a "crossover cable" or
"null-model adapter" for USB. (I am ignoring USB OTG
<http://en.wikipedia.org/wiki/USB_On-The-Go>  for the moment, since you want
the RPi to talk to the UPS). There are many USB adapter cables out there
that will only work for supplying power, or only with point-to-point USB


Charles Lepple
clepple at gmail


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